Laminated material



LAMINATED MATERIAL Filed June 22, 1932 wsmwmmwmmww /RUBBER Patented June 12, 1934 LAMINATED MATERIAL William Case, St. Louis, Mo., assigner to Be Bro. Bag Co., St. Louis, Mo., a corporation of Missouri Application June z2, 1932 sensi' Np. 618,632

6 Claims.

and with regard to certain more specific features, to laminated materials comprising, generally,

fabric layers secured to paper layers, adapted for,

use in the manufacture of lined bags.

Among the several objects of the invention may be noted the provision of laminated fabrics of the class described in which asphalt is used as an adhesive to join together two ,or moreof the 10 layers, but in which the fabric layer is so 'treated as to be resistant to stains caused, for. example, by softening of the asphalt with excessive heat, pressure, solvent action, or the like; the provision of a fabric of the class described which has improved waterproof, as well as acidand alkaliproof, qualities; and the provision of a fabric of the class describedwherein the fabric layer, for example, burlap, is treated so that its tendency to shed bers and the like is eliminatedor greatly minimized. Other objects will be in partv obvious and in part pointed out hereinafter.

The invention accordingly comprises the' ele' ments and combinations of elements, features of construction, and arrangements of parts which will be exemplified in the structures hereinafter described, and the scope of the application of which' will be indicated in the following claims. In the accompanying drawing, in which are illustrated several of various possible embodiw-men'ts of the invention:

Fig. l is an enlarged section showing one cmbodiment of the invention;

Fig. 2 is an enlarged section showing a second embodiment of the invention; I

Fig. 3 is an enlarged section showing a third embodiment of the invention; and,

Fig. i is an enlarged section showing a fourth' embodiment of the invention.

Similar reference characters indicate corre- 40V.spending parts throughout the several views of the drawing.

Lined fabric is a commodity well-known in the bag manufacturing art. Bass made from such lined fabric are used chiefly for deliquescent and -1ike materials.

Heretofore the customary construction of such lined or laminated fabrics has been substantially a layer of fabric l(usually burlap), having amxed I' thereto with asphalt a layer of paper (usually .crepe paper). Frequently a. further layer of paper is amxed, also with asphalt, to the rst paper layer." A fault of this material is that when het materials are charged into bags constructed therefrom, the asphalt softens and the rfabric is badly stained thereby. Such staining renders the bags prematurely old-appearing, and further makes them difficult to handle, as the stained fabric is tacky and adjacent bags tend to stick together to an undesirable extent.

Asphalt cannot economically be done`- away with entirely, and substituted by other adhesives to cure this staining problem, because in the first place, no other adhesive can compete with asphalt as regards its cost, andin the second place, it has many desirable qualities (exibility, suicient tackiness, water-imperviousness, acid and alkali resistance, andthe like) which substitute adhesives do not oder. ,For this reason, the cure for the staining problem is more advantageous if it does not require the^elimination of asphalt entirely from the material.

The present invention falls within the last category. Brey, the present invention comprises protecting the fabric layer with a coating of rubber material, whereby it is rendered impervious (and hence unstainable) by the heated asphalt adhesive.

Referring now more particularly to Fig. l, there is illustrated at numeral 1 a fabric layer, such as burlap. Secured to the buriap l by a layer of coagulated latex 2 is a, layer of crepe or like lining p'aper 3. A layer 4 of asphalt (relatively thicker than the rubber-latex layer 2) binds a. second paper layer 5 to the paper layer 3.

The paper layers 3 and 5 are usually impervious to the asphalt layer 4, even when it is warmed or softened. But even if the layer 3 is somewhat pervious, the iatex'layer 2 so protects the burlap l thatno asphalt can penetrate therethrough and stain the burlap l. rl'lie asphalt layer 4, how- 9@ ever, provides the principal water-proofing medium, as in prior materials.

In Fig. 2 is illustrated another emlmidinrient oi the invention in which a latex or rubber layer 6 is aflixed to one side of the burlap 1, whilethe l asphalt layer 4 joins the other side of the burlap l to the paper liner 3. In this embodiment, the latex 6 suiilciently penetrates the burlap to render it impervious to the asphalt e, even though the asphalt 4 directly adjoins the burlap. This is be- N0 cause the burlap is practically impregnated with the latex, and the latex is repellent to the staining, warmed asphalt.

' The Fig. 3 embodiment of the invention is quite similar to the Fig. 2 embodiment, the only change W5 being that a furtherlayer '7 of asphalt and a layer 8 of paper are aflxed to the first paper layer 3. This embodiment isparticularly suited for extreme conditions, such as the storage of calclum chloride and the like.

In the Fig. 4 embodiment of the invention, layers of latex 6 and 2 are applied to both outer and inner sides of the fabric 1, respectively, thus securing an additional protective effect. The Fig. 4 embodiment is otherwise similarto the embodiments shown in the other figures.

From the foregoing. descriptions, it will be seen that the rubber latex layer exerts a protective effect on the fabric regardless of the side upon tween the asphalt and the burlap, While in Figs.

which it is positioned. In Fig. 1, the latex is be- 2' and 3 it is on the opposite side ofthe burlap from the asphalt. It is eicacious to prevent staining in either position.

While latex adhesives are considered to be the most desirable rubber material for the purposes of the present invention, other rubber materials may be used. For example, benzol solutions of rubber, gutta-percha, balata, or the like may be when the material is formed into bags and used for packaging foodstuffs, such as granulated sugar, in which event the foodstuff is not contaminated with burlap fibers orlint.

It will be understood that, although the accompanying drawing shows asphalt and rubber layers of considerable thickness, this is done for clarity only, and in practice the layers are rela.- tively quite thin. The rubber, as has been 'indicated, is desirably in the form of latex or latex ...compounds when applied, and the layers 2 and 6 "may be so thin as not to be altogether continuous '(although continuity is desirable).

Layer 2 is sufliciently continuous, however, to prevent the asphalt from migrating into the fabric or through the openings in the weave to the face of the fabric. Layer 6 is preferably a wash coating .penetrating the bers of the fabric to some extent, and partially encircling them, and to some extent forming fllms in the openings of the weave of the fabric.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As many changes could be made in carrying out the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a. limit-J ing sense. f*

I claim:

1. A laminated material particularly adapted for manufacture into bags comprising a. layer of fabric, at least one layer of paper, and at least one layer of asphalt adhesive, and a layer of rub--l ber positioned with respect to said fabric so as to prevent the same from being substantially stained by said asphalt.

2. In a laminated material comprising vlayers v of fabric and paper and adhesive/asphaltgmeans for preventing said asphalt from substantially staining said fabric comprising a layer of rubber. 3. A laminated material comprising a layer of fabric, a layer of rubber derived from latex on one side of said fabric and penetrating the same, a layer of asphalton the other side of said fabric, and a layer of paper joined to said fabric b the said asphalt layer.

4. 'A laminated material comprising a layer of fabric, .a layer of rubber derived from latex on one side. of said fabric and penetrating the same, a layer of adhesive material on the other side of said fabric, and a layer of paper joined to said fabric by the said layer of adhesive material.

5. A laminated material comprising a layer of fabric, a layer of rubber derived from latex juxtaposed to said fabric layer, a layer of paper juxtaposed and joined to said rubber layer, a layer of adhesive material juxtaposed and joined to said paper layer, and a second layer of paperjuxtaposed and joined tothe other side of said adhesive layer.

6. A laminated material comprising a layer of fabric, layers of rubber derived from latex juxtaposed to said fabric layer on both sides thereof and penetrating the same, a layer of paper juxtposed and joined to one of said rubber layers, a layer of adhesive material juxtaposed and joined to said paper layer, and a second layer of paper juxtaposed and -joined to the other side of said adhesive layer.

WILLIAM CASE. 

